Nybergite

Chemical formula: Ca₄Sc₃Sn⁴⁺(Si₂O₇)(Si₂O₆OH)₃

Nybergite is a very rare mineral from the sorosilicate group, discovered in Norway, distinguished by its unique chemical composition containing scandium and tin.

## Characteristics Nybergite is an extremely rare mineral belonging to the silicates, specifically to the sorosilicates of the kristiansenite group. It has been identified in the form of small, anhedral (not exhibiting their own crystal faces) grains, not exceeding 0.5 mm in size. These grains are intergrown with other minerals. Due to its extreme rarity and small size of known samples, its full visual characterization is limited. ## Physical Properties The mineral is transparent to translucent, with a vitreous luster. Its Mohs hardness is approximately 6. The density has been calculated as 3.55 g/cm³. No luminescence in ultraviolet light has been observed. ## Colors and Varieties Nybergite is colorless. No colored or commercial varieties are known. ## History and Name The mineral is named in honor of Gunnar Nyberg (born 1929), a Norwegian mineral collector who discovered the first samples. Nybergite was approved as a new mineral species by the International Mineralogical Association (IMA) in 2013 (IMA2013-067). It was described by Roy

Properties

Mohs hardness
6
Luster
Vitreous
Streak
White
Density
3.55
Cleavage
Good
Fracture
Uneven
Transparency
Transparent to Translucent
Crystal system
Triclinic

Diagnostic features

## Identification Identification of nybergite is possible only through advanced laboratory methods, such as X-ray microanalysis (EDS/WDS) and X-ray diffraction (XRD), due to its unique chemical composition with the presence of scandium and tin. Visually, it is indistinguishable from many other colorless minerals found in its environment. ## Distinguishing from Similar Minerals In the form of small grains, it can be confused with quartz, albite, or other light pegmatitic minerals. Certain differentiation requires specialized chemical analysis. ## Crystal Forms Nybergite occurs as anhedral, irregular grains up to 0.5 mm in size, often intergrown with other minerals.

Geological environment

## Genesis Nybergite is a magmatic mineral, crystallizing in the late stage of granite pegmatite evolution. It forms under conditions enriched in rare elements such as scandium, tin, and yttrium. ## Mineral Associations This mineral co-occurs with other rare pegmatitic minerals such as kristiansenite, cassiterite, albite, microcline, quartz, beryl, fluorite, hematite, muscovite, zircon, titanite, keiviite-(Y), and minerals from the gadolinite group. ## Localities The only confirmed occurrence of nybergite in the world is its type locality - the Heftetjern granite pegmatite in Tørdal, Telemark region, Norway.

Rarity

Extremely rare

For collectors

## Quality Criteria As a "micromount" mineral, of purely scientific and systematic significance, the only criterion for value is the confirmation of its presence in the sample through analysis. Every verified specimen is extremely valuable for specialized collections and research institutions. ## Popular Localities The only source of specimens is the Heftetjern pegmatite in Norway. The material is extremely difficult to obtain and identify.

Care and storage

## Cleaning Due to the extreme rarity and small size of the grains, nybergite specimens are not subject to standard cleaning. Any attempts at mechanical or chemical intervention may irreversibly destroy the research material. ## What to Avoid Avoid contact with chemicals, ultrasound, and extreme temperature changes. As a silicate mineral, it may be sensitive to hydrofluoric acid. ## Storage Specimens containing nybergite should be stored under stable conditions, in specialized "micromount" containers, protecting them from dust, moisture, and mechanical damage.

External references

Sources

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